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Question

What happens when dilute hydrochloric acid is added to iron filings? 
  1. hydrochloric acid dissociates.
  2. iron molecules are oxidised.
  3. hydrogen ions are reduced.
  4. hydrogen gas and iron chloride are produced.


Solution

The correct options are
A hydrochloric acid dissociates.
B iron molecules are oxidised.
C hydrogen ions are reduced.
D hydrogen gas and iron chloride are produced.
In the given reaction, hydrochloric acid dissociates. The released chloride ions oxidize the iron molecules. The hydrogen ions are reduced to hydrogen gas. Therefore, hydrogen gas and iron chloride are produced.

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